I'll do it any time a hen goes broody, winter or summer. The disadvantage to me, since I normally free range, is that the forage is not as good in the winter and I wind up paying more for feed. Otherwise, a winter hatch fits right in with my goals. But I don't incubate in the winter unless I have a broody hen. The power does occasionally go off out here and I would not have a good way to heat a brooder.